Picture frame



FIG. 1 is a front perspective view of a picture frame showing my new design,

FIG. 2 is a front elevational view thereof,

FIG. 3 is a rear elevational view thereof,

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a picture frame, substantially as shown and described. 